1. First create the partitions on a disk. In my case I created partitions on a different disk from the root partition.
2. Figure out the uuids:
3. Move /opt, as it's the easiest (should be reasonably static).
Edit /etc/fstab:
Move the old /opt and mount the new one:
And you should be good to go. Check with df -h:
4. Move /var and /tmp
You can use init 1 according to http://unix.stackexchange.com/questions/131311/moving-var-home-to-separate-partition. Note that doing so will kill your graphical session and stop or restart most of the services i.e. close open documents before your continue. You'll then get dumped into a vty.
Open a terminal and type
which dumps you into a root terminal. Then, as root, do
Changing the permissions for /tmp is important -- if they aren't generous enough it can cause all sorts of issues. In my case it was manifested by me being unable to log onto a GUI (e.g. gnome) from GDM3 -- I would get booted back to the login screen.
Edit /etc/fstab and add:
Once you've established that all is well you can delete /var.old and /tmp.old.
df -h shows
2. Figure out the uuids:
ls /dev/disk/by-uuid -lahI know that I'm looking for sbd2 (label: tmp), sdb3 (label: opt) and sdb4 (label: var). We'll use these uuids later for our /etc/fstab
lrwxrwxrwx 1 root root 10 Oct 22 14:02 28b59809-7dfb-4ce4-a4da-6f118171ea07 -> ../../sdb2
lrwxrwxrwx 1 root root 9 Oct 22 14:45 52f07f83-3a72-457c-b25f-7aa4f3e76461 -> ../../sdc
lrwxrwxrwx 1 root root 10 Oct 7 14:42 8a5ca4ae-9963-47ea-99c3-2335c7dc8118 -> ../../sda6
lrwxrwxrwx 1 root root 10 Oct 7 14:42 9243ff6b-9834-4fa3-a93f-10a350f85687 -> ../../sda1
lrwxrwxrwx 1 root root 10 Oct 22 14:02 9f785dde-1d3a-4063-90e7-054f3d031e05 -> ../../sdb3
lrwxrwxrwx 1 root root 10 Oct 22 14:02 eacf2cad-d462-45b2-afeb-2c5ddf5669b8 -> ../../sdb4
lrwxrwxrwx 1 root root 10 Oct 7 14:42 f25a484c-e8e2-4ead-808b-96dd5e915020 -> ../../sda5
lrwxrwxrwx 1 root root 10 Oct 22 14:02 f4280c34-04d6-4def-963a-507e68dd483d -> ../../sdb1
3. Move /opt, as it's the easiest (should be reasonably static).
sudo udisks --mount /dev/sdb3
Mounted /org/freedesktop/UDisks/devices/sdb3 at /media/opt
sudo cp -ax /opt/* /media/opt
Edit /etc/fstab:
UUID=9f785dde-1d3a-4063-90e7-054f3d031e05 /opt ext4 defaults,user_xattr 0 2
Move the old /opt and mount the new one:
sudo mv /opt /opt.old
sudo mount /opt
And you should be good to go. Check with df -h:
[..]
/dev/sdb3 72G 28G 41G 41% /opt
4. Move /var and /tmp
You can use init 1 according to http://unix.stackexchange.com/questions/131311/moving-var-home-to-separate-partition. Note that doing so will kill your graphical session and stop or restart most of the services i.e. close open documents before your continue. You'll then get dumped into a vty.
Open a terminal and type
init 1
which dumps you into a root terminal. Then, as root, do
mkdir /media/var
mount /dev/sdb4 /media/var
cp -ax /var/* /media/var
mkdir /media/tmp
mount /dev/sdb2 /media/tmp
cp -ax /tmp/* /media/tmp
mv /tmp /tmp.old
mv /var /var.old
mkdir /tmp
chmod 777 /tmp
mkdir /var
umount /media/var
umount /media/tmp
Changing the permissions for /tmp is important -- if they aren't generous enough it can cause all sorts of issues. In my case it was manifested by me being unable to log onto a GUI (e.g. gnome) from GDM3 -- I would get booted back to the login screen.
Edit /etc/fstab and add:
Note: I don't know what the best values for the attributes are. I just took what I used for /home, which is probably not optimal. You may want to do your own research into this. Then do
UUID=28b59809-7dfb-4ce4-a4da-6f118171ea07 /tmp ext4 defaults,user_xattr 0 2
UUID=eacf2cad-d462-45b2-afeb-2c5ddf5669b8 /var ext4 defaults,user_xattr 0 2
mount /tmp
mount /var
init 2
Once you've established that all is well you can delete /var.old and /tmp.old.
df -h shows
Filesystem Size Used Avail Use% Mounted on
rootfs 92G 32G 56G 37% /
udev 10M 0 10M 0% /dev
tmpfs 798M 1.1M 797M 1% /run
/dev/disk/by-uuid/9243ff6b-9834-4fa3-a93f-10a350f85687 92G 32G 56G 37% /
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 4.6G 88K 4.6G 1% /run/shm
/dev/sda6 734G 555G 142G 80% /home
/dev/sdb3 72G 28G 41G 41% /opt
/dev/sdb2 72G 53M 69G 1% /tmp
/dev/sdb4 48G 8.8G 37G 20% /var
This is dummy text. It is not meant to be read. Accordingly, it is difficult to figure out when to end it. But then, this is dummy text. It is not meant to be read. Period.
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